Module node 

GBP-layer group node.

Responsibilities of this layer (analogous to IP):

• Decode incoming CBOR frames and validate version, group_id, epoch and transition_id per the GBP spec.
• Enforce a per-(stream_type, stream_id) replay window via sequence_no.
• Open the AEAD payload through the Sealer trait (typically backed by gbp-mls).
• Surface decoded payloads to sub-protocols as Event::PayloadReceived; the sub-protocol layer is responsible for message-level semantics.
• Drive the control plane: handle EXECUTE_TRANSITION, request resync on EPOCH_MISMATCH, etc.

Out of scope: parsing GTP / GAP / GSP payloads, GTP idempotency, GAP key_phase validation and mute-list tracking. Those concerns belong to the per-sub-protocol clients in the gtp-protocol, gap-protocol and gsp-protocol crates.

Structs

DeliveredPayload

Information about a payload delivered by GBP to a sub-protocol.

GroupNode

GBP-layer node.

OutboundFrame

A wire-ready outbound frame: the recipient and its serialised CBOR bytes.

Enums

Event

Events surfaced by the GBP layer.

NodeError

Errors raised by GroupNode.

Traits

Sealer

Trait abstracting the AEAD seal / open operations.